Writing desk



FIG. 1 is a perspective view of a writing desk showing my new design;

FIG. 2 is a front view of the writing desk, the rear view being the same;

FIG. 3 is a plan view of the writing desk;

FIG. 4 is a right-hand side view of the writing desk, the left-hand side view being the same; and,

FIG. 5 is a bottom view of the writing desk. 

The ornamental design for a writing desk, as shown and described. 